Hello Shehzad Mohammad! The provided adapters are for Danfoss valves RA, RAV and RAVL only. Drayton needs another adapter. The Drayton TRV 4 does not need an adapter at all, your seems to. Are you sure it is 28mm? I only found one that comes with M27 x 1,0? You may want to contact me at [email protected]
Best regards, volker
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Sep 2, 2021